Pressure responsive device



March 27, 1951 Q D, PEN'DLETON 2,546,403

PRESSURE RESPONSIVE rDEVICE:

Filed March 13, 1948 all' ` E lill/[114110111114 INVENTOR. CLYDE D.APENDLE'I'ON ATTOR NEY Patented Mar. 27,- 1951 UNITED STATES PATENTOFFICE PRESSURE RESPONSIVE DEVICE `Clyde D. Pendleton, Eugene, Oreg.

Application March 13, 1948, Serial No. 14,737

A3 claims. l This invention relates to a pressure responsive devicewherein liquid pressure is applied on one side of a rubbery diaphragm,stretching it a considerable amount to perform useful work; theydiaphragm afterwards returning to its normal unstretched position. Suchdevices have often been proposed but they have one weak pointthediaphragm must be held at or near to its perimeter, by compressionbetween two flanges (usually), it being found impossible to equalize theholding grip sufllciently to avoid greatly shortening the life of thediaphragm.

The object of the invention, in short, is to take advantage of theobvious virtues of the diaphragm and cancel or greatly modify itstendency to tear loose at its edge, especially when subjected to aconsiderable stretch.

A drawing accompanies and forms a part hereof in which the invention isillustrated in its best'form, yas now advised, and a schematic set-up,wherein the invention is used, as on a logging truck, shows one valuableway in which it can be employed; but it is not intended to indicate alimit to its usefulness.

In the drawing:

Fig. 1 is a side view of a hydraulic ram employing the invention, thecylinder and a part of the ram being broken away to show a section ofthe new packing, in non-active position;

Fig. 2 is the same structure as shown in Fig. 1, save that the ram hasbeen pumped up to load sustaining position; and

Fig. 3 is a section of Fig. 1, taken on the plane 3-3, Fig. 1.

Explaining the drawings in greater detail, numeral I is a plain metalcylinder having a lower cap closure 2, that is detachably attached tothe cylinder by adequate means such as bolts 3, which engage with aflanged portion II, of the cylinder I. A ram 4, is a sliding t in thecylinder I.

A highly resilient diaphragm packing of neoprene synthetic rubber orequal, is designated by numeral 5. It is preferably made thicker in itsmedian area as shown in Fig. 1 and the ram 4 will be concaved to receivethe thickened portion without initial compressive stress on thediaphragm 5. The diaphragm 5 is circular in form, of materially greaterdiameter than the ram 4 and has a metal wire ring 6, embedded in andvulcanized ilrmly to the inside of the rubber bead 1, which surroundsit.` The flange I I is machined at I2, into a groove that rmly holds thebead I2 and its contained wire ring 6, when the bolts such as 3, arescrewed home,

thus holding the diaphragm by its perimeter and concurrently sealing thecap 2 to the cylinder I. The operation of the device is at once obviousfrom the illustrations in Figs. 1 and 2. i

A conduit 8, is in communication with the lower side of the diaphragm 5,and will be fed from a pump and reservoir diagrammatically indicated bythe pipe 9, which is broken oi.

To avoid time consuming hard labor, the rams will be pumped up beforethe load is applied; the distance, maximum, being not over threequartersof an inch, though the larger the diameter of the ram, the relativelygreater distance of lift there will be available.

The layout includes schematic indications as follows: Numeral I3represents a solid part of a truck frame and I4 represents a loadcarrying bunk upon the truck frame, upon which logs or the like areloaded, as indicated by arrows I5 in Fig. 2.

It will be observed in Fig. 2 that the ram 4, has been raised by theforced introduction of hydraulic iluid beneath it, which has stretchedthe diaphragm 5, somewhat thinning its initially thick median area I6,so that the ram 4 may raise without thinning the diaphragmdisadvantageously. The thinning in the drawing is somewhat exaggeratedto bring it out.

The diaphragm does not slide over the inside surface of the cylinder I,but is like it was unreeled from a store of rubber. When the ram 4 israised, preferably before load is applied to save unnecessary hardlabor, then the valve I 'I will be closed, entrapping the fluid in thecreated fluid chamber I8. The pressure gauge I9, will be calibrated toindicate applied load as indicated by the arrows I5 and if there are,say four of the rams, one under each end of the customary two bunks, thetotal load will be the sum of four gauge readings. As soon as that isnoted, each of the rams may be dropped by opening their respectivecontrol valves.

I claim:

1. In a pressure responsive device, a cylinder, said cylinder beingformed with an integral flanged end, a nished annular groove in saidflanged end, a detachable head therefor, bolt means for securing saidhead to said flanged end, a beaded diaphragm of resilient rubberymaterial mounted between said head and said cylinder, an annular metalring vulcanized within said bead, said bead being of a diameter that thebead will match said annular groove to hold the diaphragm by itsperimeter when the same is held to the head by said bolt means. and

means for introducing hydraulic uid between said head and said diaphragmto apply pressure against said diaphragm.

2. In a pressure responsive device comprising a cylinder, said cylinderformed with an integral flanged end, a semi-circular annular groove insaid ilanged end, a stretchable rubbery diaphragm moulded with anintegral bead perimeter, said bead being of a size and shape to matchthe annular groove, a metal ring embedded in 10 said bead, a headmatched and held against said diaphragm by bolts or the like to compresssaid metal containing bead against said semicircular groove, and thesaid diaphragm arranged to receive hydraulic pressure on one side.

3. In a pressure responsive device, a cylinder having a anged end, adetachable head secured to said flange, a groove in said angecl end,said head being planar, an elastic diaphragm formed 4 with an integralbead portion forming its perinied ter secured to said flange by saidhead, said bead of the same perimeter as said groove to t therein and ametal ring vulcanized Within said bead. CLYDE D. PENDLETON.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNTED STATES PATENTS Y Number Name Date 1,479,733 Quinn Jan. 1, 19241,791,717 De Vito Feb. 10, 1931 1,964,745 Sauzedde July 3, 19342,272,304 Lohman Feb. 10, 1942 42,372,302 Swindin Mar. 27, 19452,437,552 Quiroz Mar. 9, 1948

